:root {
    --primary: #0d6efd;
    --primary-dark: #0a58ca;
    --dark: #212529;
    --light-bg: #f8f9fa;
    --card-bg: #ffffff;
    --text-muted: #6c757d;
    --text-body: #212529;
    --hero-gradient: linear-gradient(135deg, #0d6efd08 0%, #6610f208 50%, #0d6efd08 100%);
    --shadow-sm: 0 .125rem .25rem rgba(0,0,0,.075);
    --shadow-md: 0 .5rem 1rem rgba(0,0,0,.1);
}

[data-bs-theme="dark"] {
    --primary: #3d8bfd;
    --primary-dark: #0a58ca;
    --dark: #f8f9fa;
    --light-bg: #0f0f1a;
    --card-bg: #1a1a2e;
    --text-muted: #9ca3af;
    --text-body: #e5e7eb;
    --hero-gradient: linear-gradient(135deg, #0d6efd15 0%, #6610f215 50%, #0d6efd15 100%);
    --shadow-sm: 0 .125rem .25rem rgba(0,0,0,.3);
    --shadow-md: 0 .5rem 1rem rgba(0,0,0,.4);
}

[data-bs-theme="dark"] .bg-light {
    background-color: #1a1a2e !important;
}

[data-bs-theme="dark"] .text-muted {
    color: #9ca3af !important;
}

[data-bs-theme="dark"] .card {
    background-color: var(--card-bg);
    border-color: #2d2d4a;
}

[data-bs-theme="dark"] .card-footer {
    background-color: #15152a !important;
}

[data-bs-theme="dark"] .btn-outline-dark {
    border-color: #6c757d;
    color: #e5e7eb;
}

[data-bs-theme="dark"] .btn-outline-dark:hover {
    background-color: #6c757d;
    color: #fff;
}

[data-bs-theme="dark"] .navbar {
    background-color: #0a0a15 !important;
}

[data-bs-theme="dark"] footer {
    background-color: #0a0a15 !important;
    border-top-color: #2d2d4a !important;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 70px;
}

body {
    font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    background: var(--light-bg);
    padding-top: 56px;
    color: var(--text-body);
    transition: background-color 0.3s ease, color 0.3s ease;
}

section[id] {
    scroll-margin-top: 80px;
}

.hero-section {
    position: relative;
    background: var(--hero-gradient);
    background-size: 200% 200%;
    animation: heroShift 10s ease infinite;
    border-radius: 0 0 2rem 2rem;
    padding: 3rem 0;
    margin: -1.5rem -1rem 0;
    padding-left: 1rem;
    padding-right: 1rem;
}

@keyframes heroShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.hero-avatar {
    width: 240px;
    height: 240px;
    object-fit: cover;
    border: 4px solid var(--primary);
    box-shadow: 0 0 30px rgba(13, 110, 253, 0.2);
    transition: transform 0.3s ease;
}

.hero-avatar:hover {
    transform: scale(1.03);
}

.hero-avatar-placeholder {
    width: 240px;
    height: 240px;
    background: linear-gradient(135deg, var(--primary), #6610f2);
    font-size: 5rem;
    font-weight: 700;
    border: 4px solid rgba(255,255,255,0.3);
    box-shadow: 0 0 30px rgba(13, 110, 253, 0.2);
}

.badge-pulse {
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.card {
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    border: none;
    background: var(--card-bg);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md) !important;
}

.project-card .card-btn {
    border: none;
    font-weight: 600;
    transition: all 0.25s ease;
    position: relative;
    overflow: hidden;
}

.project-card .card-btn:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.skill-card {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.skill-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md) !important;
}

.tech-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 0.9rem;
    border-radius: 50rem;
    font-size: 0.85rem;
    font-weight: 500;
    background: var(--card-bg);
    border: 1px solid rgba(13, 110, 253, 0.15);
    color: var(--text-body);
    transition: all 0.2s ease;
    cursor: default;
}

.tech-badge:hover {
    border-color: var(--primary);
    background: rgba(13, 110, 253, 0.05);
    transform: translateY(-1px);
}

.tech-badge i {
    font-size: 1rem;
}

.tech-badge-sm {
    padding: 0.25rem 0.65rem;
    font-size: 0.75rem;
}

[data-bs-theme="dark"] .tech-badge {
    border-color: rgba(255,255,255,0.1);
}

[data-bs-theme="dark"] .tech-badge:hover {
    border-color: var(--primary);
    background: rgba(13, 110, 253, 0.15);
}

.transition-base {
    transition: all 0.2s ease;
}

.btn-social {
    transition: all 0.25s ease;
}

.btn-social:hover {
    transform: scale(1.12);
}

.nav-link {
    position: relative;
    font-weight: 500;
    transition: color 0.2s ease;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 8px;
    right: 8px;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
}

.navbar-brand {
    font-weight: 800;
    letter-spacing: 0.5px;
    font-size: 1.4rem;
}

.display-1 {
    font-size: calc(2.8rem + 3vw);
    letter-spacing: -2px;
}

footer a {
    text-decoration: none;
    transition: opacity 0.2s ease;
}

footer a:hover {
    opacity: 0.8;
}

.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: #fff;
    border: none;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1050;
    cursor: pointer;
    box-shadow: var(--shadow-md);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-3px);
    background: var(--primary-dark);
}

.timeline-item {
    position: relative;
    padding-left: 2rem;
    padding-bottom: 1.5rem;
    border-left: 2.5px solid var(--primary);
    margin-left: 0.5rem;
}

.timeline-item:last-child {
    border-left-color: transparent;
    padding-bottom: 0;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -7px;
    top: 6px;
    width: 13px;
    height: 13px;
    border-radius: 50%;
    background: var(--primary);
    border: 3px solid var(--light-bg);
    box-shadow: 0 0 0 2px var(--primary);
}

[data-bs-theme="dark"] .timeline-item::before {
    border-color: var(--card-bg);
}

.timeline-date {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--primary);
}

.progress-thin {
    height: 8px;
    border-radius: 4px;
    background: rgba(13, 110, 253, 0.1);
}

.progress-thin .progress-bar {
    border-radius: 4px;
    background: linear-gradient(90deg, var(--primary), #6610f2);
    transition: width 1s ease;
}

.cert-badge {
    background: linear-gradient(135deg, #0d6efd 0%, #6610f2 100%);
    color: white;
}

.cert-card {
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.cert-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md) !important;
    border-color: rgba(13, 110, 253, 0.2);
}

.section-title {
    position: relative;
    display: inline-block;
    margin-bottom: 2.5rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--primary);
    border-radius: 3px;
}

.section-title.text-start::after {
    left: 0;
    transform: none;
}

.about-card {
    backdrop-filter: blur(10px);
    background: rgba(33, 37, 41, 0.95);
}

[data-bs-theme="dark"] .about-card {
    background: rgba(26, 26, 46, 0.95);
}

@media (max-width: 768px) {
    .display-1 {
        font-size: 2.5rem;
        letter-spacing: -1px;
    }

    .hero-avatar,
    .hero-avatar-placeholder {
        width: 160px;
        height: 160px;
    }

    .hero-avatar-placeholder {
        font-size: 3.5rem;
    }

    .hero-section {
        border-radius: 0;
        padding: 2rem 0;
    }

    .timeline-item {
        padding-left: 1.5rem;
    }
}

@media (max-width: 992px) {
    .hero-section {
        padding: 2rem 0.5rem;
    }
}